Compass is a Java framework which makes it simple to map your Java object model into a search engine. It is built on top of the Lucene search engine. Compass features declarative mapping technology OSEM (similar to O/R database mapping), transaction management, Google-like query syntax, externalization of common metadata, and much much more.
Tapestry Palette is a plugin for Eclipse that builds upon the Spindle plugin. The palette provides a tree view of Tapestry component libraries, a component inspector to discover parameters available with links to HTML documentation, drag and drop addition of Tapestry component references to templates, and a Property Sheet for editing of component bindings. The plugin can be installed from within Eclipse via an update site.
Necessitas is an Eclipse plug-in that adds a class-path container to manage a projects jars using the ivy dependency manager. It gives you all of the advantages of ivy without leaving Eclipse. It will download the jars your project depends on and add them to your projects classpath. You can optionally have it automatically update your classpath whenever a change is made to the ivy module.